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# NS1 APP. A - 24 Hour Clock

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Bishop Kenny NJROTC NS1Lesson 24 Hour Clock

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### NS1 APP. A - 24 Hour Clock

1. 1. The 24-hour Clock
2. 2. The military does not measure time by the standard 12-hour clock. It uses the 24-hour clock.
3. 3. A 12-hour clock uses numbers from 1 to 12 followed by a.m. or p.m. to identify each of the 24 hours in a day. What does a.m. and p.m. stand for?
4. 4. What does a.m. and p.m. stand for? a.m. — ANTE MERIDIEM, or before noon p.m. — POST MERIDIEM, or afternoon
5. 5. The military uses the 24-hour clock, which uses the numbers 0000 through 2400. Under this system, midnight is 0000 or 2400, 1 a.m. is 0100, 1 p.m. is 1300, and so on.
6. 6. Because a unique number designates each hour, there is no need to follow it by a.m. or p.m.
7. 7. Military Time • Based on a 24-hour time standard What is the military time above, both a.m. and p.m.?
8. 8. Military Time • Based on a 24-hour time standard What is the military time above, both a.m. and p.m.? 0301 or 1501
9. 9. Standard Time vs. Military Time Midnight = 0000 or 2400 1:00 a.m. = 0100 2:00 a.m. = 0200 3:00 a.m. = 0300 4:00 a.m. = 0400 5:00 a.m. = 0500 6:00 a.m. = 0600 7:00 a.m. = 0700 8:00 a.m. = 0800 9:00 a.m. = 0900 10:00 a.m. = 1000 11:00 a.m. = 1100
10. 10. Standard Time vs. Military Time Noon = 1200 1:00 p.m. = 1300 2:00 p.m. = 1400 3:00 p.m. = 1500 4:00 p.m. = 1600 5:00 p.m. = 1700 6:00 p.m. = 1800 7:00 p.m. = 1900 8:00 p.m. = 2000 9:00 p.m. = 2100 10:00 p.m. = 2200 11:00 p.m. = 2300
11. 11. What about Military Minutes? Minutes are measured the same way in military time as they are in standard time, using the numbers 01 to 59. Example: 11:45 p.m. standard time would be written 2345 military time.
12. 12. Why is midnight 0000 and not 2400? Sometimes with the military and emergency services personnel midnight is expressed both ways.
13. 13. Military time is always expressed in hours and minutes without a colon and add the word “hours” afterward. Example: 0301 hours
14. 14. When military time needs to be expressed down to the second, you insert a colon between the minutes and seconds. Example: 0301:38 hours
15. 15. What time would it be on the 24-hour clock for the following times? A. 7:00 a.m. B. 12:30 p.m. C. 6:50 p.m. D. 9:15 p.m. E. Midnight
16. 16. What time would it be on the 24-hour clock for the following times? A. 7:00 a.m. 0700 hours B. 12:30 p.m. 1230 hours C. 6:50 p.m. 1850 hours D. 9:15 p.m. 2115 hours E. Midnight 0000 or 2400 hours
17. 17. Conclusion Learning how to convert standard time to military time will greatly benefit you when on base and ship visits.